| Rank
|
Senator (party-state)
|
Seniority date
|
Other factors
|
| 1
|
Richard Russell, Jr.[7] (D-GA)
|
January 12, 1933
|
| 2
|
Allen J. Ellender[8] (D-LA)
|
January 3, 1937
|
| 3
|
George Aiken (R-VT)
|
January 10, 1941
|
| 4
|
James Eastland (D-MS)
|
January 3, 1943
|
Previously a senator
|
| 5
|
John Little McClellan (D-AR)
|
| 6
|
Warren G. Magnuson (D-WA)
|
December 14, 1944
|
| 7
|
J. William Fulbright (D-AR)
|
January 3, 1945
|
| 8
|
Milton Young (R-ND)
|
March 12, 1945
|
| 9
|
John Sparkman (D-AL)
|
November 6, 1946
|
| 10
|
John C. Stennis (D-MS)
|
November 17, 1947
|
| 11
|
Karl Mundt (R-SD)
|
December 31, 1948
|
Former representative
|
| 12
|
Russell B. Long (D-LA)
|
| 13
|
Margaret Chase Smith (R-ME)
|
January 3, 1949
|
Former representative
|
| 14
|
Clinton Anderson (D-NM)
|
| 15
|
John O. Pastore (D-RI)
|
December 19, 1950
|
| 16
|
Wallace F. Bennett (R-UT)
|
January 3, 1951
|
| 17
|
Henry M. Jackson (D-WA)
|
January 3, 1953
|
Former representative (12 years)
|
| 18
|
Mike Mansfield (D-MT)
|
Former representative (10 years)
|
| 19
|
Stuart Symington (D-MO)
|
| 20
|
Sam Ervin (D-NC)
|
June 5, 1954
|
| 21
|
Norris Cotton (R-NH)
|
November 8, 1954
|
Former representative (7 years, 10 months)
|
| 22
|
Roman Hruska (R-NE)
|
Former representative (1 year, 10 months)
|
| 23
|
Alan Bible (D-NV)
|
December 2, 1954
|
| 24
|
Carl Curtis (R-NE)
|
January 1, 1955
|
| 25
|
Clifford P. Case (R-NJ)
|
January 3, 1955
|
Former representative
|
| 26
|
Gordon L. Allott (R-CO)
|
| 27
|
John Sherman Cooper (R-KY)
|
November 7, 1956
|
Previously a senator (twice) (total tenure 4 years, 4 months)
|
| 28
|
Strom Thurmond (R-SC)
|
Previously a senator (1 year, 3 months)
|
| 29
|
Herman Talmadge (D-GA)
|
January 3, 1957
|
Former governor
|
| 30
|
Frank Church (D-ID)
|
| 31
|
Jacob K. Javits (R-NY)
|
January 9, 1957
|
| 32
|
William Proxmire (D-WI)
|
August 28, 1957
|
| 33
|
Ben Jordan (D-NC)
|
April 19, 1958
|
| 34
|
Jennings Randolph (D-WV)
|
November 5, 1958
|
| 35
|
Hugh Scott (R-PA)
|
January 3, 1959
|
Former representative (18 years)
|
| 36
|
Winston L. Prouty[9] (R-VT)
|
Former representative (8 years)
|
| 37
|
Robert Byrd (D-WV)
|
Former representative (6 years)
|
| 38
|
Harrison A. Williams (D-NJ)
|
Former representative (4 years)
|
| 39
|
Edmund Muskie (D-ME)
|
Former governor
|
| 40
|
Philip Hart (D-MI)
|
Michigan 7th in population (1950)
|
| 41
|
Vance Hartke (D-IN)
|
Indiana 11th in population (1950)
|
| 42
|
Frank Moss (D-UT)
|
Utah 38th in population (1950)
|
| 43
|
Gale W. McGee (D-WY)
|
Wyoming 48th in population (1950)
|
| 44
|
Howard Cannon (D-NV)
|
Nevada 49th in population (1950)
|
| 45
|
Hiram Fong (R-HI)
|
August 21, 1959
|
| 46
|
Quentin Northrup Burdick (D-ND)
|
August 8, 1960
|
| 47
|
Lee Metcalf (D-MT)
|
January 3, 1961
|
Former representative (8 years)
|
| 48
|
James Boggs (R-DE)
|
Former representative (6 years)
|
| 49
|
Jack Miller (R-IA)
|
Iowa 22nd in population (1950)
|
| 50
|
Claiborne Pell (D-RI)
|
Rhode Island 36th in population (1950)
|
| 51
|
John Tower (R-TX)
|
June 15, 1961
|
| 52
|
James B. Pearson (R-KS)
|
January 31, 1962
|
| 53
|
Leonard B. Jordan (R-ID)
|
August 6, 1962
|
| 54
|
Ted Kennedy (D-MA)
|
November 7, 1962
|
Massachusetts 9th in population (1960)
|
| 55
|
Thomas J. McIntyre (D-NH)
|
New Hampshire 45th in population (1960)
|
| 56
|
Abraham A. Ribicoff (D-CT)
|
January 3, 1963
|
Former representative (4 years), former cabinet secretary, former governor
|
| 57
|
George McGovern (D-SD)
|
Former representative (4 years) – South Dakota 40th in population (1960)
|
| 58
|
Daniel Inouye (D-HI)
|
Former representative (4 years) – Hawaii 43rd in population (1960)
|
| 59
|
Peter H. Dominick (R-CO)
|
Former representative (2 years)
|
| 60
|
Birch Bayh (D-IN)
|
| 61
|
Gaylord Nelson (D-WI)
|
January 7, 1963
|
| 62
|
Joseph Montoya (D-NM)
|
November 4, 1964
|
Former representative
|
| 63
|
Fred R. Harris (D-OK)
|
| 64
|
Walter Mondale (D-MN)
|
December 30, 1964
|
| 65
|
Paul Fannin (R-AZ)
|
January 3, 1965
|
| 66
|
Harry F. Byrd, Jr. (I-VA)
|
November 12, 1965
|
| 67
|
Robert P. Griffin (R-MI)
|
May 11, 1966
|
| 68
|
Ernest Hollings (D-SC)
|
November 9, 1966
|
| 69
|
William B. Spong, Jr. (D-VA)
|
December 31, 1966
|
| 70
|
Clifford Hansen (R-WY)
|
January 3, 1967
|
Former governor
|
| 71
|
Charles H. Percy (R-IL)
|
Illinois 4th in population (1960)
|
| 72
|
Edward Brooke (R-MA)
|
Massachusetts 9th in population (1960)
|
| 73
|
Howard Baker (R-TN)
|
Tennessee 17th in population (1960)
|
| 74
|
Mark Hatfield (R-OR)
|
January 10, 1967
|
| 75
|
Marlow Cook (R-KY)
|
December 17, 1968
|
| 76
|
Ted Stevens (R-AK)
|
December 24, 1968
|
| 77
|
Thomas Eagleton (D-MO)
|
December 28, 1968
|
| 78
|
Barry Goldwater (R-AZ)
|
January 3, 1969
|
Previously a senator
|
| 79
|
Richard Schweiker (R-PA)
|
Former representative (8 years) – Pennsylvania 3rd in population (1969)
|
| 80
|
Charles Mathias (R-MD)
|
Former representative (8 years) – Maryland 21st in population (1960)
|
| 81
|
Bob Dole (R-KS)
|
Former representative (8 years) – Kansas 29th in population (1960)
|
| 82
|
Edward J. Gurney (R-FL)
|
Former representative (6 years)
|
| 83
|
Harold Hughes (D-IA)
|
Former governor, Iowa 24th in population (1960)
|
| 84
|
Henry Bellmon (R-OK)
|
Former governor, Oklahoma 27th in population (1960)
|
| 85
|
Alan Cranston (D-CA)
|
California 2nd in population (1960)
|
| 86
|
William B. Saxbe (R-OH)
|
Ohio 5th in population (1960)
|
| 87
|
James Allen (D-AL)
|
Alabama 19th in population (1960)
|
| 88
|
Bob Packwood (R-OR)
|
Oregon 32nd in population (1960)
|
| 89
|
Mike Gravel (D-AK)
|
Alaska 50th in population (1960)
|
| 90
|
Adlai Stevenson III (D-IL)
|
November 17, 1970
|
| 91
|
Bill Roth (R-DE)
|
January 1, 1971
|
| 92
|
John V. Tunney (D-CA)
|
January 2, 1971
|
| 93
|
Hubert Humphrey (D-MN)
|
January 3, 1971
|
Previously a senator, former VP
|
| 94
|
Robert Taft, Jr. (R-OH)
|
Former representative (8 years) – Ohio 5th in population (1960)
|
| 95
|
Bill Brock (R-TN)
|
Former representative (8 years) – Tennessee 17th in population (1960)
|
| 96
|
Lloyd Bentsen (D-TX)
|
Former representative (6 years)
|
| 97
|
John Glenn Beall, Jr. (R-MD)
|
Former representative (2 years) – Maryland 21st in population (1960)
|
| 98
|
Lowell Weicker (R-CT)
|
Former representative (2 years) – Connecticut 25th in population (1960)
|
| 99
|
James L. Buckley (C/R-NY)
|
New York 1st in population (1960)
|
| 100
|
Lawton Chiles (D-FL)
|
Florida 10th in population (1960)
|
| 101
|
David H. Gambrell (D-GA)
|
February 1, 1971
|
| 102
|
Robert Stafford (R-VT)
|
September 16, 1971
|
| 103
|
Elaine S. Edwards (D-LA)
|
August 1, 1972
|
| 104
|
Sam Nunn (D-GA)
|
November 8, 1972
|
| 105
|
Bennett Johnston Jr. (D-LA)
|
November 14, 1972
|
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